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LONDON (Reuters) - Prime Minister Theresa May has an open mind on what Britain's relationship with the European will look like after Brexit and will not put all her cards on the table before negotiating their divorce, her spokeswoman said on Tuesday.

May used her first international trip to China this week to outline the first details of what she wants from Brexit after almost 52 percent of Britons voted to leave the EU in June.

She ruled out a points-based immigration system, while her minister charged with negotiating Brexit, David Davis, said Britain did not need to be a member of the EU's single market to have access to it.

"The prime minister has set out that we are going to need to be able address people's concerns about migration within the European Union and get the best possible deal in trade and services and now work is under way. She is approaching that with an open mind," her spokeswoman told reporters.

"This is a negotiation, it is not always the right approach to start putting all your cards on the table at the start."